Installation of new hard drive. Hello I have recently installed a new PATA hard drive in my PC-

Question

Hello I have recently installed a new PATA hard drive in my PC- the CPU is an Athlon 2600+ and the motherboard is an ASUS- A7V8X-MX.
The problem is that I get an error message come up against 'other devices' in device manager. The message is a yellow question mark against 'PCI Simple Controller'- I'm guessing that this is a driver issue however I haven't got the drivers to install. I have trawled the Net for a driver but I am having no luck- could you point me in the right direction......PLEASE.